Well,
of course this is crazy. But with enough time on one's hands (which I don't
have anyway), one could build this sixteen foot monster and roar across
some upstate NY lake with some buddies... or town hop the shore of Lake
Michigan. The "pan" is 3/4" ply, integral with the box member running down
the middle. The box member takes the downward force of the mast... which
is transferred from the mast ball by a stout aluminum tube.

These
cutaway shots show the pan, and how it relates to the crossplank, mast
support tube and front suspension. Click on the front view for a larger
image.

The
front suspension is welded 1/4" plate steel, with a motorcycle monoshock
taking the bumps, and keeping the steering runner on the ice. I don't
show the steering linkage attached to the bell crank ball.